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Stock compensation expense by functional category (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2023 | Oct. 31, 2022
Share-Based Payment Arrangement [Abstract] |  |  |  |
Operations | $ 238,522 | $ 225,879 | $ 429,621 | $ 384,310
Research and development | 147,629 | 209,497 | 275,046 | 354,295
Sales and marketing | 208,903 | 162,269 | 374,212 | 269,343
General and administrative | 601,271 | 649,151 | 1,029,052 | 994,319
Total | $ 1,196,325 | $ 1,246,796 | $ 2,107,931 | $ 2,002,267

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